Multiple-cluster-lamp receptacle.



F. S. OBER.

MULTIPLE CLUSTER LAMP REGEPTAGLE. APPLICATION FILED FEB. 26,1909.

1 925,830. Patented June 22,1909.

a a lm-almanac: ,3 0) WW Whom "RANK sums 085]? citizen of, the United States, residing at the I metallic Multiple-Oluster-Lam FRANK. SOMES OBEILOF NEW YORK, N. Y.

1 QTIPLE-CLUS'IER-LAMP RECEPTACLE.

Specification of Letters Patent.

Patented June 22, 1909.

Application filed February 26, 1909. Serial No. 480,162.

To all whom it may concern.

Be it known that I, FRANK SOMEs OBER, a

city of New York; in the borough of Manhattan and State of New York, have invented c'crtain'new and useful Improvements in Receptacles, of which the-following is r. ful clear, and exact description.

My invention relates to cluster lamp receptacles, particularly multiple cluster receptacles where two, three, four or other number of incandescent lamps protrude ra- 'lially outward from a central supporting tion is to greatl cipaleleinents of the cluster,

- vention.

construction.

, block base or fixture.

.Theprincipal object of the present inven simplify and cheapen rece tacles of this 0 ass. I have all the metal ic parts included in two simple sheet metal stampings, together, of course, with the necessary assemb ing screws. These stampings are organized upon a porcelain or insulating and retained within a hemispherical casing by bushin s of the usual character.

It is particular y a desirable characteristic of my invention that the two main parts above referred to, which constitute the prinare the inside and; outside' 'cuttings of a single blanking or punching-process. The advantages of this as a factor for saving time as well as material are obvious; "The complete lamp receptacle has several advantages over the constructions" hitherto in use, among the most prominent of which may be mentioned the snug -engagement ofthe threaded shells with the usua bushings which is secured by my in- Another advantage arises from the fact that many parts heretofore separately formed, are integral in my invention,.making thebest possible mechanical and electrical connections, beside simplifying the As will later appear, the form of the central porcelain block or base is such as to have an important part in fixing the position of the various metallic elements thereto.

The invention also includes a new form of shell blank as an article of manufacture.

In the drawings: Figure 1 is a vertical sectional View 'of a receptacle embodying the principles of my invention; Fig. 2 is a to plan View; Fi 3 is a plan view oi the blan fronr which" t e main metallic element includmg the threaded shells is formed. Fig. 4

\ is an edge View of the same showing one of shape on t the shells completed, and Fig. 5 is a plan view of the blank forming the other principal element ol the rec cptacle,'which establishes the center contacts.

The plate or blank 1 of Fig. 3 may be denoted a major blank and the blank 2 of Fig. 5 may be termed a minor blank. These terms are articularly appropriate as the minor blanli 2 is ordinarily simply the cut-out of the center of the blank 1. This, of course, is not an essential, but is a very convenient method of manufacture. The blank 1 is shown nearly square with cut-away corners 3 and cuts or serrations 4 extending diagonally inward and terminating in square punched holes 5. The center of the blank is cut-away in a cross-shaped outline 6. As already referred to, the blank 2 has this same general outline and is preferably additionally punched with a non-circular central hole 7.

The plate or blank 1 is subjected to a forniing process by which the four sides are curledarouni 'tnd ribbed or corrugated to produce threaded shells 8. These are crescent-shaped or arcuate in transverse section, instead of being complete cylinders, as usual. This form is important in that it permits the manufacture from the stamped sheet metal blank, and also because it secures an advantageous, novel result as later described. The

material of the blank is also bent at 9 so that the axes of the threaded shells are deflected r diagonally downward at the inclination which is usual in receptacles of this class.

12 denotes an insulating base or block with a flat upper face 12 and a central protuberance 14 with ribs 15 adapted to enter the recesses 6 of theblank 1 and fix the position of the latter.

13 denotes screws by which the blank is held on the block 12. The center contact element 2 has its extremities deflected upwardly to form the center contact prongs 14. This part. has its position fixed on the block 12 by the engagement of its non-circular hole 7 with a rotuberance 7 of corres onding e under side of said bloc The plate is held in this position by a fastening screw or screws 16.

l7 and 18-denote terminal screws for the threaded shell plate and for the center contact plate, respectively.

The parts are assembled within the casing 20 by the usual-insulating bushings 21 which fix the threaded shells 8 in place and thereby support all the other parts. The curvature 7 oikiameter of the threaded shells 8 is made 1 theother having bent up prongs constituting,

a little larger than normal 'so that they will center contacts. be compressed and restricted somewhat by 3. Amultiple clusterlamp receptacle comtheir engagement in the bushings, thus in'sur prising an insulating base and two metallic ing a snug, close connection with the bushl lates supported thereby, one of said plates ings in a very simple manner. l being formed with integral curved corrugated -While I have described with particularity l extremities constituting threaded shells andv the details of a four lamp receptacle, it will having a central opening, and another plate be obviousthat the principles of the inven- I having center contacts and having a detion are equally a plicable to a two lamp, veloped outline corresponding to said openthree lamp, a five am -or other cluster rel ing, as and for the purpose set forth. ceptacle. The 4. A multiple cluster lamp receptacle comarticu ar form and proportions of the bla (s 1 and 2 of the supporting i prising an insulating base and two metallic this entire part or element is a single sheet metal plate instead of a compound structure,

block 12 are not essential except in so far as plates supported respectively on the upper they are necessary to secure the functions set and lower faces of said base, the upper plate forth'in the preliminary art of this specifii being formed with integral curved corrucation. However, I pre er the proportions gated extremities constituting threaded shownas best adapted to the particular shells and the other having center contacts. instance of a four lamp receptacle. 1 5. A multiple cluster receptacle compris- In the foregoing description I have emphaing an insulating base with non-circular prosized the features ofthe com lete constructuberances on its upper and lower faces and tion, as distinguished from t e features of two metallic plates respectively supported on the process of making the construction. the faces, of said base, the up er of said plates. The claims and scope of the present applibeing fiiiined with integra curved'corrucation are intended to relate to the structure. gated i/cxtro nities constituting threaded as distinct from the process of making it; i shells andhavinga. central opening adapted the invention of the rocess being claimed to fit over the upper protuberancesof sai in another case to be filed by the same applibase, and the lower plate having an open' cant. to fit over the lower protuberance of sa' -The invention of'the present case resides base. in the structural characteristics of the sepal 6. A multiple clusterrecdtacle comprisrate component parts of the receptacle and ling an insulating base an two i metallic also in certain combinations thereof. The

plates supported by saidbase, one of 881d blank for the threaded shell members will be plates being formed with integral curved corseen to have several features of novelty,

rugated extremities constituting threaded among them being the corrugated extremishells, said shells having a resiliency to exties curved to form incomplete threaded pand to a larger diameterthini n rmal, and

shells: incomplete in the sense that they are the other plate haviingcenter co tacts, and

not continuous and seamless around their biiishinlgs adapted to screw uppn said thread- 0( she s.

circumference in the usual manner. This p a fact has an advantage as described. Also 7 As an article of manufacture, a blank curved corrugated extremities constituting being simply stam ed and formed into the 1 threaded shells. required s ape an outline. l 8. As an article of manufacture, a blank What I claim is: comprising a plate "formed with integral 1. A multiple cluster lamp receptacle comprisin an insulating base and two principal threaded shells and having a central opening metal ic elements secured to sai 1 base, one of extended in a plurality of directions corre said elements being formed with integral spending to the number of threaded shells, curved corru ated extremities constituting as and for the, urpose'set forth. threaded shel s, and the other having center In witness w er'eof, I, subscribe my signacontacts. I ture, in the presence oftwo witnesses. r

2. A multiple cluster receptacle coin ris- FRANK SOMES OBER ing an insulating base and two metallic p ates s i supported b said base, one. of said plates being forme with integral curved corrugated extremities constituting threaded shells, and l Witnesses WM. M. Srocxenrnea. W ALDO M. CHAPIN.

des'

comprising a plate formed-with integral curved corrugatedextrelnities constitut ng 

